net/dump: Separate the NetClientState from the DumpState
[qemu/ar7.git] / block / raw-posix.c
blob918c756c2eaf71519c974481b5a5cdb323b9f0d6
1 /*
2 * Block driver for RAW files (posix)
4 * Copyright (c) 2006 Fabrice Bellard
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
24 #include "qemu-common.h"
25 #include "qemu/error-report.h"
26 #include "qemu/timer.h"
27 #include "qemu/log.h"
28 #include "block/block_int.h"
29 #include "qemu/module.h"
30 #include "trace.h"
31 #include "block/thread-pool.h"
32 #include "qemu/iov.h"
33 #include "raw-aio.h"
34 #include "qapi/util.h"
35 #include "qapi/qmp/qstring.h"
37 #if defined(__APPLE__) && (__MACH__)
38 #include <paths.h>
39 #include <sys/param.h>
40 #include <IOKit/IOKitLib.h>
41 #include <IOKit/IOBSD.h>
42 #include <IOKit/storage/IOMediaBSDClient.h>
43 #include <IOKit/storage/IOMedia.h>
44 #include <IOKit/storage/IOCDMedia.h>
45 //#include <IOKit/storage/IOCDTypes.h>
46 #include <CoreFoundation/CoreFoundation.h>
47 #endif
49 #ifdef __sun__
50 #define _POSIX_PTHREAD_SEMANTICS 1
51 #include <sys/dkio.h>
52 #endif
53 #ifdef __linux__
54 #include <sys/types.h>
55 #include <sys/stat.h>
56 #include <sys/ioctl.h>
57 #include <sys/param.h>
58 #include <linux/cdrom.h>
59 #include <linux/fd.h>
60 #include <linux/fs.h>
61 #include <linux/hdreg.h>
62 #include <scsi/sg.h>
63 #ifdef __s390__
64 #include <asm/dasd.h>
65 #endif
66 #ifndef FS_NOCOW_FL
67 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
68 #endif
69 #endif
70 #if defined(CONFIG_FALLOCATE_PUNCH_HOLE) || defined(CONFIG_FALLOCATE_ZERO_RANGE)
71 #include <linux/falloc.h>
72 #endif
73 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
74 #include <sys/disk.h>
75 #include <sys/cdio.h>
76 #endif
78 #ifdef __OpenBSD__
79 #include <sys/ioctl.h>
80 #include <sys/disklabel.h>
81 #include <sys/dkio.h>
82 #endif
84 #ifdef __NetBSD__
85 #include <sys/ioctl.h>
86 #include <sys/disklabel.h>
87 #include <sys/dkio.h>
88 #include <sys/disk.h>
89 #endif
91 #ifdef __DragonFly__
92 #include <sys/ioctl.h>
93 #include <sys/diskslice.h>
94 #endif
96 #ifdef CONFIG_XFS
97 #include <xfs/xfs.h>
98 #endif
100 //#define DEBUG_BLOCK
102 #ifdef DEBUG_BLOCK
103 # define DEBUG_BLOCK_PRINT 1
104 #else
105 # define DEBUG_BLOCK_PRINT 0
106 #endif
107 #define DPRINTF(fmt, ...) \
108 do { \
109 if (DEBUG_BLOCK_PRINT) { \
110 printf(fmt, ## __VA_ARGS__); \
112 } while (0)
114 /* OS X does not have O_DSYNC */
115 #ifndef O_DSYNC
116 #ifdef O_SYNC
117 #define O_DSYNC O_SYNC
118 #elif defined(O_FSYNC)
119 #define O_DSYNC O_FSYNC
120 #endif
121 #endif
123 /* Approximate O_DIRECT with O_DSYNC if O_DIRECT isn't available */
124 #ifndef O_DIRECT
125 #define O_DIRECT O_DSYNC
126 #endif
128 #define FTYPE_FILE 0
129 #define FTYPE_CD 1
131 #define MAX_BLOCKSIZE 4096
133 typedef struct BDRVRawState {
134 int fd;
135 int type;
136 int open_flags;
137 size_t buf_align;
139 #ifdef CONFIG_LINUX_AIO
140 int use_aio;
141 void *aio_ctx;
142 #endif
143 #ifdef CONFIG_XFS
144 bool is_xfs:1;
145 #endif
146 bool has_discard:1;
147 bool has_write_zeroes:1;
148 bool discard_zeroes:1;
149 bool has_fallocate;
150 bool needs_alignment;
151 } BDRVRawState;
153 typedef struct BDRVRawReopenState {
154 int fd;
155 int open_flags;
156 #ifdef CONFIG_LINUX_AIO
157 int use_aio;
158 #endif
159 } BDRVRawReopenState;
161 static int fd_open(BlockDriverState *bs);
162 static int64_t raw_getlength(BlockDriverState *bs);
164 typedef struct RawPosixAIOData {
165 BlockDriverState *bs;
166 int aio_fildes;
167 union {
168 struct iovec *aio_iov;
169 void *aio_ioctl_buf;
171 int aio_niov;
172 uint64_t aio_nbytes;
173 #define aio_ioctl_cmd aio_nbytes /* for QEMU_AIO_IOCTL */
174 off_t aio_offset;
175 int aio_type;
176 } RawPosixAIOData;
178 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
179 static int cdrom_reopen(BlockDriverState *bs);
180 #endif
182 #if defined(__NetBSD__)
183 static int raw_normalize_devicepath(const char **filename)
185 static char namebuf[PATH_MAX];
186 const char *dp, *fname;
187 struct stat sb;
189 fname = *filename;
190 dp = strrchr(fname, '/');
191 if (lstat(fname, &sb) < 0) {
192 fprintf(stderr, "%s: stat failed: %s\n",
193 fname, strerror(errno));
194 return -errno;
197 if (!S_ISBLK(sb.st_mode)) {
198 return 0;
201 if (dp == NULL) {
202 snprintf(namebuf, PATH_MAX, "r%s", fname);
203 } else {
204 snprintf(namebuf, PATH_MAX, "%.*s/r%s",
205 (int)(dp - fname), fname, dp + 1);
207 fprintf(stderr, "%s is a block device", fname);
208 *filename = namebuf;
209 fprintf(stderr, ", using %s\n", *filename);
211 return 0;
213 #else
214 static int raw_normalize_devicepath(const char **filename)
216 return 0;
218 #endif
221 * Get logical block size via ioctl. On success store it in @sector_size_p.
223 static int probe_logical_blocksize(int fd, unsigned int *sector_size_p)
225 unsigned int sector_size;
226 bool success = false;
228 errno = ENOTSUP;
230 /* Try a few ioctls to get the right size */
231 #ifdef BLKSSZGET
232 if (ioctl(fd, BLKSSZGET, &sector_size) >= 0) {
233 *sector_size_p = sector_size;
234 success = true;
236 #endif
237 #ifdef DKIOCGETBLOCKSIZE
238 if (ioctl(fd, DKIOCGETBLOCKSIZE, &sector_size) >= 0) {
239 *sector_size_p = sector_size;
240 success = true;
242 #endif
243 #ifdef DIOCGSECTORSIZE
244 if (ioctl(fd, DIOCGSECTORSIZE, &sector_size) >= 0) {
245 *sector_size_p = sector_size;
246 success = true;
248 #endif
250 return success ? 0 : -errno;
254 * Get physical block size of @fd.
255 * On success, store it in @blk_size and return 0.
256 * On failure, return -errno.
258 static int probe_physical_blocksize(int fd, unsigned int *blk_size)
260 #ifdef BLKPBSZGET
261 if (ioctl(fd, BLKPBSZGET, blk_size) < 0) {
262 return -errno;
264 return 0;
265 #else
266 return -ENOTSUP;
267 #endif
270 /* Check if read is allowed with given memory buffer and length.
272 * This function is used to check O_DIRECT memory buffer and request alignment.
274 static bool raw_is_io_aligned(int fd, void *buf, size_t len)
276 ssize_t ret = pread(fd, buf, len, 0);
278 if (ret >= 0) {
279 return true;
282 #ifdef __linux__
283 /* The Linux kernel returns EINVAL for misaligned O_DIRECT reads. Ignore
284 * other errors (e.g. real I/O error), which could happen on a failed
285 * drive, since we only care about probing alignment.
287 if (errno != EINVAL) {
288 return true;
290 #endif
292 return false;
295 static void raw_probe_alignment(BlockDriverState *bs, int fd, Error **errp)
297 BDRVRawState *s = bs->opaque;
298 char *buf;
299 size_t max_align = MAX(MAX_BLOCKSIZE, getpagesize());
301 /* For SCSI generic devices the alignment is not really used.
302 With buffered I/O, we don't have any restrictions. */
303 if (bdrv_is_sg(bs) || !s->needs_alignment) {
304 bs->request_alignment = 1;
305 s->buf_align = 1;
306 return;
309 bs->request_alignment = 0;
310 s->buf_align = 0;
311 /* Let's try to use the logical blocksize for the alignment. */
312 if (probe_logical_blocksize(fd, &bs->request_alignment) < 0) {
313 bs->request_alignment = 0;
315 #ifdef CONFIG_XFS
316 if (s->is_xfs) {
317 struct dioattr da;
318 if (xfsctl(NULL, fd, XFS_IOC_DIOINFO, &da) >= 0) {
319 bs->request_alignment = da.d_miniosz;
320 /* The kernel returns wrong information for d_mem */
321 /* s->buf_align = da.d_mem; */
324 #endif
326 /* If we could not get the sizes so far, we can only guess them */
327 if (!s->buf_align) {
328 size_t align;
329 buf = qemu_memalign(max_align, 2 * max_align);
330 for (align = 512; align <= max_align; align <<= 1) {
331 if (raw_is_io_aligned(fd, buf + align, max_align)) {
332 s->buf_align = align;
333 break;
336 qemu_vfree(buf);
339 if (!bs->request_alignment) {
340 size_t align;
341 buf = qemu_memalign(s->buf_align, max_align);
342 for (align = 512; align <= max_align; align <<= 1) {
343 if (raw_is_io_aligned(fd, buf, align)) {
344 bs->request_alignment = align;
345 break;
348 qemu_vfree(buf);
351 if (!s->buf_align || !bs->request_alignment) {
352 error_setg(errp, "Could not find working O_DIRECT alignment. "
353 "Try cache.direct=off.");
357 static void raw_parse_flags(int bdrv_flags, int *open_flags)
359 assert(open_flags != NULL);
361 *open_flags |= O_BINARY;
362 *open_flags &= ~O_ACCMODE;
363 if (bdrv_flags & BDRV_O_RDWR) {
364 *open_flags |= O_RDWR;
365 } else {
366 *open_flags |= O_RDONLY;
369 /* Use O_DSYNC for write-through caching, no flags for write-back caching,
370 * and O_DIRECT for no caching. */
371 if ((bdrv_flags & BDRV_O_NOCACHE)) {
372 *open_flags |= O_DIRECT;
376 static void raw_detach_aio_context(BlockDriverState *bs)
378 #ifdef CONFIG_LINUX_AIO
379 BDRVRawState *s = bs->opaque;
381 if (s->use_aio) {
382 laio_detach_aio_context(s->aio_ctx, bdrv_get_aio_context(bs));
384 #endif
387 static void raw_attach_aio_context(BlockDriverState *bs,
388 AioContext *new_context)
390 #ifdef CONFIG_LINUX_AIO
391 BDRVRawState *s = bs->opaque;
393 if (s->use_aio) {
394 laio_attach_aio_context(s->aio_ctx, new_context);
396 #endif
399 #ifdef CONFIG_LINUX_AIO
400 static int raw_set_aio(void **aio_ctx, int *use_aio, int bdrv_flags)
402 int ret = -1;
403 assert(aio_ctx != NULL);
404 assert(use_aio != NULL);
406 * Currently Linux do AIO only for files opened with O_DIRECT
407 * specified so check NOCACHE flag too
409 if ((bdrv_flags & (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) ==
410 (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) {
412 /* if non-NULL, laio_init() has already been run */
413 if (*aio_ctx == NULL) {
414 *aio_ctx = laio_init();
415 if (!*aio_ctx) {
416 goto error;
419 *use_aio = 1;
420 } else {
421 *use_aio = 0;
424 ret = 0;
426 error:
427 return ret;
429 #endif
431 static void raw_parse_filename(const char *filename, QDict *options,
432 Error **errp)
434 /* The filename does not have to be prefixed by the protocol name, since
435 * "file" is the default protocol; therefore, the return value of this
436 * function call can be ignored. */
437 strstart(filename, "file:", &filename);
439 qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename)));
442 static QemuOptsList raw_runtime_opts = {
443 .name = "raw",
444 .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head),
445 .desc = {
447 .name = "filename",
448 .type = QEMU_OPT_STRING,
449 .help = "File name of the image",
451 { /* end of list */ }
455 static int raw_open_common(BlockDriverState *bs, QDict *options,
456 int bdrv_flags, int open_flags, Error **errp)
458 BDRVRawState *s = bs->opaque;
459 QemuOpts *opts;
460 Error *local_err = NULL;
461 const char *filename = NULL;
462 int fd, ret;
463 struct stat st;
465 opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort);
466 qemu_opts_absorb_qdict(opts, options, &local_err);
467 if (local_err) {
468 error_propagate(errp, local_err);
469 ret = -EINVAL;
470 goto fail;
473 filename = qemu_opt_get(opts, "filename");
475 ret = raw_normalize_devicepath(&filename);
476 if (ret != 0) {
477 error_setg_errno(errp, -ret, "Could not normalize device path");
478 goto fail;
481 s->open_flags = open_flags;
482 raw_parse_flags(bdrv_flags, &s->open_flags);
484 s->fd = -1;
485 fd = qemu_open(filename, s->open_flags, 0644);
486 if (fd < 0) {
487 ret = -errno;
488 if (ret == -EROFS) {
489 ret = -EACCES;
491 goto fail;
493 s->fd = fd;
495 #ifdef CONFIG_LINUX_AIO
496 if (raw_set_aio(&s->aio_ctx, &s->use_aio, bdrv_flags)) {
497 qemu_close(fd);
498 ret = -errno;
499 error_setg_errno(errp, -ret, "Could not set AIO state");
500 goto fail;
502 if (!s->use_aio && (bdrv_flags & BDRV_O_NATIVE_AIO)) {
503 error_printf("WARNING: aio=native was specified for '%s', but "
504 "it requires cache.direct=on, which was not "
505 "specified. Falling back to aio=threads.\n"
506 " This will become an error condition in "
507 "future QEMU versions.\n",
508 bs->filename);
510 #else
511 if (bdrv_flags & BDRV_O_NATIVE_AIO) {
512 error_printf("WARNING: aio=native was specified for '%s', but "
513 "is not supported in this build. Falling back to "
514 "aio=threads.\n"
515 " This will become an error condition in "
516 "future QEMU versions.\n",
517 bs->filename);
519 #endif /* !defined(CONFIG_LINUX_AIO) */
521 s->has_discard = true;
522 s->has_write_zeroes = true;
523 if ((bs->open_flags & BDRV_O_NOCACHE) != 0) {
524 s->needs_alignment = true;
527 if (fstat(s->fd, &st) < 0) {
528 ret = -errno;
529 error_setg_errno(errp, errno, "Could not stat file");
530 goto fail;
532 if (S_ISREG(st.st_mode)) {
533 s->discard_zeroes = true;
534 s->has_fallocate = true;
536 if (S_ISBLK(st.st_mode)) {
537 #ifdef BLKDISCARDZEROES
538 unsigned int arg;
539 if (ioctl(s->fd, BLKDISCARDZEROES, &arg) == 0 && arg) {
540 s->discard_zeroes = true;
542 #endif
543 #ifdef __linux__
544 /* On Linux 3.10, BLKDISCARD leaves stale data in the page cache. Do
545 * not rely on the contents of discarded blocks unless using O_DIRECT.
546 * Same for BLKZEROOUT.
548 if (!(bs->open_flags & BDRV_O_NOCACHE)) {
549 s->discard_zeroes = false;
550 s->has_write_zeroes = false;
552 #endif
554 #ifdef __FreeBSD__
555 if (S_ISCHR(st.st_mode)) {
557 * The file is a char device (disk), which on FreeBSD isn't behind
558 * a pager, so force all requests to be aligned. This is needed
559 * so QEMU makes sure all IO operations on the device are aligned
560 * to sector size, or else FreeBSD will reject them with EINVAL.
562 s->needs_alignment = true;
564 #endif
566 #ifdef CONFIG_XFS
567 if (platform_test_xfs_fd(s->fd)) {
568 s->is_xfs = true;
570 #endif
572 raw_attach_aio_context(bs, bdrv_get_aio_context(bs));
574 ret = 0;
575 fail:
576 if (filename && (bdrv_flags & BDRV_O_TEMPORARY)) {
577 unlink(filename);
579 qemu_opts_del(opts);
580 return ret;
583 static int raw_open(BlockDriverState *bs, QDict *options, int flags,
584 Error **errp)
586 BDRVRawState *s = bs->opaque;
587 Error *local_err = NULL;
588 int ret;
590 s->type = FTYPE_FILE;
591 ret = raw_open_common(bs, options, flags, 0, &local_err);
592 if (local_err) {
593 error_propagate(errp, local_err);
595 return ret;
598 static int raw_reopen_prepare(BDRVReopenState *state,
599 BlockReopenQueue *queue, Error **errp)
601 BDRVRawState *s;
602 BDRVRawReopenState *raw_s;
603 int ret = 0;
604 Error *local_err = NULL;
606 assert(state != NULL);
607 assert(state->bs != NULL);
609 s = state->bs->opaque;
611 state->opaque = g_new0(BDRVRawReopenState, 1);
612 raw_s = state->opaque;
614 #ifdef CONFIG_LINUX_AIO
615 raw_s->use_aio = s->use_aio;
617 /* we can use s->aio_ctx instead of a copy, because the use_aio flag is
618 * valid in the 'false' condition even if aio_ctx is set, and raw_set_aio()
619 * won't override aio_ctx if aio_ctx is non-NULL */
620 if (raw_set_aio(&s->aio_ctx, &raw_s->use_aio, state->flags)) {
621 error_setg(errp, "Could not set AIO state");
622 return -1;
624 #endif
626 if (s->type == FTYPE_CD) {
627 raw_s->open_flags |= O_NONBLOCK;
630 raw_parse_flags(state->flags, &raw_s->open_flags);
632 raw_s->fd = -1;
634 int fcntl_flags = O_APPEND | O_NONBLOCK;
635 #ifdef O_NOATIME
636 fcntl_flags |= O_NOATIME;
637 #endif
639 #ifdef O_ASYNC
640 /* Not all operating systems have O_ASYNC, and those that don't
641 * will not let us track the state into raw_s->open_flags (typically
642 * you achieve the same effect with an ioctl, for example I_SETSIG
643 * on Solaris). But we do not use O_ASYNC, so that's fine.
645 assert((s->open_flags & O_ASYNC) == 0);
646 #endif
648 if ((raw_s->open_flags & ~fcntl_flags) == (s->open_flags & ~fcntl_flags)) {
649 /* dup the original fd */
650 /* TODO: use qemu fcntl wrapper */
651 #ifdef F_DUPFD_CLOEXEC
652 raw_s->fd = fcntl(s->fd, F_DUPFD_CLOEXEC, 0);
653 #else
654 raw_s->fd = dup(s->fd);
655 if (raw_s->fd != -1) {
656 qemu_set_cloexec(raw_s->fd);
658 #endif
659 if (raw_s->fd >= 0) {
660 ret = fcntl_setfl(raw_s->fd, raw_s->open_flags);
661 if (ret) {
662 qemu_close(raw_s->fd);
663 raw_s->fd = -1;
668 /* If we cannot use fcntl, or fcntl failed, fall back to qemu_open() */
669 if (raw_s->fd == -1) {
670 const char *normalized_filename = state->bs->filename;
671 ret = raw_normalize_devicepath(&normalized_filename);
672 if (ret < 0) {
673 error_setg_errno(errp, -ret, "Could not normalize device path");
674 } else {
675 assert(!(raw_s->open_flags & O_CREAT));
676 raw_s->fd = qemu_open(normalized_filename, raw_s->open_flags);
677 if (raw_s->fd == -1) {
678 error_setg_errno(errp, errno, "Could not reopen file");
679 ret = -1;
684 /* Fail already reopen_prepare() if we can't get a working O_DIRECT
685 * alignment with the new fd. */
686 if (raw_s->fd != -1) {
687 raw_probe_alignment(state->bs, raw_s->fd, &local_err);
688 if (local_err) {
689 qemu_close(raw_s->fd);
690 raw_s->fd = -1;
691 error_propagate(errp, local_err);
692 ret = -EINVAL;
696 return ret;
699 static void raw_reopen_commit(BDRVReopenState *state)
701 BDRVRawReopenState *raw_s = state->opaque;
702 BDRVRawState *s = state->bs->opaque;
704 s->open_flags = raw_s->open_flags;
706 qemu_close(s->fd);
707 s->fd = raw_s->fd;
708 #ifdef CONFIG_LINUX_AIO
709 s->use_aio = raw_s->use_aio;
710 #endif
712 g_free(state->opaque);
713 state->opaque = NULL;
717 static void raw_reopen_abort(BDRVReopenState *state)
719 BDRVRawReopenState *raw_s = state->opaque;
721 /* nothing to do if NULL, we didn't get far enough */
722 if (raw_s == NULL) {
723 return;
726 if (raw_s->fd >= 0) {
727 qemu_close(raw_s->fd);
728 raw_s->fd = -1;
730 g_free(state->opaque);
731 state->opaque = NULL;
734 static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
736 BDRVRawState *s = bs->opaque;
738 raw_probe_alignment(bs, s->fd, errp);
739 bs->bl.min_mem_alignment = s->buf_align;
740 bs->bl.opt_mem_alignment = MAX(s->buf_align, getpagesize());
743 static int check_for_dasd(int fd)
745 #ifdef BIODASDINFO2
746 struct dasd_information2_t info = {0};
748 return ioctl(fd, BIODASDINFO2, &info);
749 #else
750 return -1;
751 #endif
755 * Try to get @bs's logical and physical block size.
756 * On success, store them in @bsz and return zero.
757 * On failure, return negative errno.
759 static int hdev_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz)
761 BDRVRawState *s = bs->opaque;
762 int ret;
764 /* If DASD, get blocksizes */
765 if (check_for_dasd(s->fd) < 0) {
766 return -ENOTSUP;
768 ret = probe_logical_blocksize(s->fd, &bsz->log);
769 if (ret < 0) {
770 return ret;
772 return probe_physical_blocksize(s->fd, &bsz->phys);
776 * Try to get @bs's geometry: cyls, heads, sectors.
777 * On success, store them in @geo and return 0.
778 * On failure return -errno.
779 * (Allows block driver to assign default geometry values that guest sees)
781 #ifdef __linux__
782 static int hdev_probe_geometry(BlockDriverState *bs, HDGeometry *geo)
784 BDRVRawState *s = bs->opaque;
785 struct hd_geometry ioctl_geo = {0};
786 uint32_t blksize;
788 /* If DASD, get its geometry */
789 if (check_for_dasd(s->fd) < 0) {
790 return -ENOTSUP;
792 if (ioctl(s->fd, HDIO_GETGEO, &ioctl_geo) < 0) {
793 return -errno;
795 /* HDIO_GETGEO may return success even though geo contains zeros
796 (e.g. certain multipath setups) */
797 if (!ioctl_geo.heads || !ioctl_geo.sectors || !ioctl_geo.cylinders) {
798 return -ENOTSUP;
800 /* Do not return a geometry for partition */
801 if (ioctl_geo.start != 0) {
802 return -ENOTSUP;
804 geo->heads = ioctl_geo.heads;
805 geo->sectors = ioctl_geo.sectors;
806 if (!probe_physical_blocksize(s->fd, &blksize)) {
807 /* overwrite cyls: HDIO_GETGEO result is incorrect for big drives */
808 geo->cylinders = bdrv_nb_sectors(bs) / (blksize / BDRV_SECTOR_SIZE)
809 / (geo->heads * geo->sectors);
810 return 0;
812 geo->cylinders = ioctl_geo.cylinders;
814 return 0;
816 #else /* __linux__ */
817 static int hdev_probe_geometry(BlockDriverState *bs, HDGeometry *geo)
819 return -ENOTSUP;
821 #endif
823 static ssize_t handle_aiocb_ioctl(RawPosixAIOData *aiocb)
825 int ret;
827 ret = ioctl(aiocb->aio_fildes, aiocb->aio_ioctl_cmd, aiocb->aio_ioctl_buf);
828 if (ret == -1) {
829 return -errno;
832 return 0;
835 static ssize_t handle_aiocb_flush(RawPosixAIOData *aiocb)
837 int ret;
839 ret = qemu_fdatasync(aiocb->aio_fildes);
840 if (ret == -1) {
841 return -errno;
843 return 0;
846 #ifdef CONFIG_PREADV
848 static bool preadv_present = true;
850 static ssize_t
851 qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset)
853 return preadv(fd, iov, nr_iov, offset);
856 static ssize_t
857 qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset)
859 return pwritev(fd, iov, nr_iov, offset);
862 #else
864 static bool preadv_present = false;
866 static ssize_t
867 qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset)
869 return -ENOSYS;
872 static ssize_t
873 qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset)
875 return -ENOSYS;
878 #endif
880 static ssize_t handle_aiocb_rw_vector(RawPosixAIOData *aiocb)
882 ssize_t len;
884 do {
885 if (aiocb->aio_type & QEMU_AIO_WRITE)
886 len = qemu_pwritev(aiocb->aio_fildes,
887 aiocb->aio_iov,
888 aiocb->aio_niov,
889 aiocb->aio_offset);
890 else
891 len = qemu_preadv(aiocb->aio_fildes,
892 aiocb->aio_iov,
893 aiocb->aio_niov,
894 aiocb->aio_offset);
895 } while (len == -1 && errno == EINTR);
897 if (len == -1) {
898 return -errno;
900 return len;
904 * Read/writes the data to/from a given linear buffer.
906 * Returns the number of bytes handles or -errno in case of an error. Short
907 * reads are only returned if the end of the file is reached.
909 static ssize_t handle_aiocb_rw_linear(RawPosixAIOData *aiocb, char *buf)
911 ssize_t offset = 0;
912 ssize_t len;
914 while (offset < aiocb->aio_nbytes) {
915 if (aiocb->aio_type & QEMU_AIO_WRITE) {
916 len = pwrite(aiocb->aio_fildes,
917 (const char *)buf + offset,
918 aiocb->aio_nbytes - offset,
919 aiocb->aio_offset + offset);
920 } else {
921 len = pread(aiocb->aio_fildes,
922 buf + offset,
923 aiocb->aio_nbytes - offset,
924 aiocb->aio_offset + offset);
926 if (len == -1 && errno == EINTR) {
927 continue;
928 } else if (len == -1 && errno == EINVAL &&
929 (aiocb->bs->open_flags & BDRV_O_NOCACHE) &&
930 !(aiocb->aio_type & QEMU_AIO_WRITE) &&
931 offset > 0) {
932 /* O_DIRECT pread() may fail with EINVAL when offset is unaligned
933 * after a short read. Assume that O_DIRECT short reads only occur
934 * at EOF. Therefore this is a short read, not an I/O error.
936 break;
937 } else if (len == -1) {
938 offset = -errno;
939 break;
940 } else if (len == 0) {
941 break;
943 offset += len;
946 return offset;
949 static ssize_t handle_aiocb_rw(RawPosixAIOData *aiocb)
951 ssize_t nbytes;
952 char *buf;
954 if (!(aiocb->aio_type & QEMU_AIO_MISALIGNED)) {
956 * If there is just a single buffer, and it is properly aligned
957 * we can just use plain pread/pwrite without any problems.
959 if (aiocb->aio_niov == 1) {
960 return handle_aiocb_rw_linear(aiocb, aiocb->aio_iov->iov_base);
963 * We have more than one iovec, and all are properly aligned.
965 * Try preadv/pwritev first and fall back to linearizing the
966 * buffer if it's not supported.
968 if (preadv_present) {
969 nbytes = handle_aiocb_rw_vector(aiocb);
970 if (nbytes == aiocb->aio_nbytes ||
971 (nbytes < 0 && nbytes != -ENOSYS)) {
972 return nbytes;
974 preadv_present = false;
978 * XXX(hch): short read/write. no easy way to handle the reminder
979 * using these interfaces. For now retry using plain
980 * pread/pwrite?
985 * Ok, we have to do it the hard way, copy all segments into
986 * a single aligned buffer.
988 buf = qemu_try_blockalign(aiocb->bs, aiocb->aio_nbytes);
989 if (buf == NULL) {
990 return -ENOMEM;
993 if (aiocb->aio_type & QEMU_AIO_WRITE) {
994 char *p = buf;
995 int i;
997 for (i = 0; i < aiocb->aio_niov; ++i) {
998 memcpy(p, aiocb->aio_iov[i].iov_base, aiocb->aio_iov[i].iov_len);
999 p += aiocb->aio_iov[i].iov_len;
1001 assert(p - buf == aiocb->aio_nbytes);
1004 nbytes = handle_aiocb_rw_linear(aiocb, buf);
1005 if (!(aiocb->aio_type & QEMU_AIO_WRITE)) {
1006 char *p = buf;
1007 size_t count = aiocb->aio_nbytes, copy;
1008 int i;
1010 for (i = 0; i < aiocb->aio_niov && count; ++i) {
1011 copy = count;
1012 if (copy > aiocb->aio_iov[i].iov_len) {
1013 copy = aiocb->aio_iov[i].iov_len;
1015 memcpy(aiocb->aio_iov[i].iov_base, p, copy);
1016 assert(count >= copy);
1017 p += copy;
1018 count -= copy;
1020 assert(count == 0);
1022 qemu_vfree(buf);
1024 return nbytes;
1027 #ifdef CONFIG_XFS
1028 static int xfs_write_zeroes(BDRVRawState *s, int64_t offset, uint64_t bytes)
1030 struct xfs_flock64 fl;
1031 int err;
1033 memset(&fl, 0, sizeof(fl));
1034 fl.l_whence = SEEK_SET;
1035 fl.l_start = offset;
1036 fl.l_len = bytes;
1038 if (xfsctl(NULL, s->fd, XFS_IOC_ZERO_RANGE, &fl) < 0) {
1039 err = errno;
1040 DPRINTF("cannot write zero range (%s)\n", strerror(errno));
1041 return -err;
1044 return 0;
1047 static int xfs_discard(BDRVRawState *s, int64_t offset, uint64_t bytes)
1049 struct xfs_flock64 fl;
1050 int err;
1052 memset(&fl, 0, sizeof(fl));
1053 fl.l_whence = SEEK_SET;
1054 fl.l_start = offset;
1055 fl.l_len = bytes;
1057 if (xfsctl(NULL, s->fd, XFS_IOC_UNRESVSP64, &fl) < 0) {
1058 err = errno;
1059 DPRINTF("cannot punch hole (%s)\n", strerror(errno));
1060 return -err;
1063 return 0;
1065 #endif
1067 static int translate_err(int err)
1069 if (err == -ENODEV || err == -ENOSYS || err == -EOPNOTSUPP ||
1070 err == -ENOTTY) {
1071 err = -ENOTSUP;
1073 return err;
1076 #ifdef CONFIG_FALLOCATE
1077 static int do_fallocate(int fd, int mode, off_t offset, off_t len)
1079 do {
1080 if (fallocate(fd, mode, offset, len) == 0) {
1081 return 0;
1083 } while (errno == EINTR);
1084 return translate_err(-errno);
1086 #endif
1088 static ssize_t handle_aiocb_write_zeroes_block(RawPosixAIOData *aiocb)
1090 int ret = -ENOTSUP;
1091 BDRVRawState *s = aiocb->bs->opaque;
1093 if (!s->has_write_zeroes) {
1094 return -ENOTSUP;
1097 #ifdef BLKZEROOUT
1098 do {
1099 uint64_t range[2] = { aiocb->aio_offset, aiocb->aio_nbytes };
1100 if (ioctl(aiocb->aio_fildes, BLKZEROOUT, range) == 0) {
1101 return 0;
1103 } while (errno == EINTR);
1105 ret = translate_err(-errno);
1106 #endif
1108 if (ret == -ENOTSUP) {
1109 s->has_write_zeroes = false;
1111 return ret;
1114 static ssize_t handle_aiocb_write_zeroes(RawPosixAIOData *aiocb)
1116 #if defined(CONFIG_FALLOCATE) || defined(CONFIG_XFS)
1117 BDRVRawState *s = aiocb->bs->opaque;
1118 #endif
1120 if (aiocb->aio_type & QEMU_AIO_BLKDEV) {
1121 return handle_aiocb_write_zeroes_block(aiocb);
1124 #ifdef CONFIG_XFS
1125 if (s->is_xfs) {
1126 return xfs_write_zeroes(s, aiocb->aio_offset, aiocb->aio_nbytes);
1128 #endif
1130 #ifdef CONFIG_FALLOCATE_ZERO_RANGE
1131 if (s->has_write_zeroes) {
1132 int ret = do_fallocate(s->fd, FALLOC_FL_ZERO_RANGE,
1133 aiocb->aio_offset, aiocb->aio_nbytes);
1134 if (ret == 0 || ret != -ENOTSUP) {
1135 return ret;
1137 s->has_write_zeroes = false;
1139 #endif
1141 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE
1142 if (s->has_discard && s->has_fallocate) {
1143 int ret = do_fallocate(s->fd,
1144 FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
1145 aiocb->aio_offset, aiocb->aio_nbytes);
1146 if (ret == 0) {
1147 ret = do_fallocate(s->fd, 0, aiocb->aio_offset, aiocb->aio_nbytes);
1148 if (ret == 0 || ret != -ENOTSUP) {
1149 return ret;
1151 s->has_fallocate = false;
1152 } else if (ret != -ENOTSUP) {
1153 return ret;
1154 } else {
1155 s->has_discard = false;
1158 #endif
1160 #ifdef CONFIG_FALLOCATE
1161 if (s->has_fallocate && aiocb->aio_offset >= bdrv_getlength(aiocb->bs)) {
1162 int ret = do_fallocate(s->fd, 0, aiocb->aio_offset, aiocb->aio_nbytes);
1163 if (ret == 0 || ret != -ENOTSUP) {
1164 return ret;
1166 s->has_fallocate = false;
1168 #endif
1170 return -ENOTSUP;
1173 static ssize_t handle_aiocb_discard(RawPosixAIOData *aiocb)
1175 int ret = -EOPNOTSUPP;
1176 BDRVRawState *s = aiocb->bs->opaque;
1178 if (!s->has_discard) {
1179 return -ENOTSUP;
1182 if (aiocb->aio_type & QEMU_AIO_BLKDEV) {
1183 #ifdef BLKDISCARD
1184 do {
1185 uint64_t range[2] = { aiocb->aio_offset, aiocb->aio_nbytes };
1186 if (ioctl(aiocb->aio_fildes, BLKDISCARD, range) == 0) {
1187 return 0;
1189 } while (errno == EINTR);
1191 ret = -errno;
1192 #endif
1193 } else {
1194 #ifdef CONFIG_XFS
1195 if (s->is_xfs) {
1196 return xfs_discard(s, aiocb->aio_offset, aiocb->aio_nbytes);
1198 #endif
1200 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE
1201 ret = do_fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
1202 aiocb->aio_offset, aiocb->aio_nbytes);
1203 #endif
1206 ret = translate_err(ret);
1207 if (ret == -ENOTSUP) {
1208 s->has_discard = false;
1210 return ret;
1213 static int aio_worker(void *arg)
1215 RawPosixAIOData *aiocb = arg;
1216 ssize_t ret = 0;
1218 switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
1219 case QEMU_AIO_READ:
1220 ret = handle_aiocb_rw(aiocb);
1221 if (ret >= 0 && ret < aiocb->aio_nbytes) {
1222 iov_memset(aiocb->aio_iov, aiocb->aio_niov, ret,
1223 0, aiocb->aio_nbytes - ret);
1225 ret = aiocb->aio_nbytes;
1227 if (ret == aiocb->aio_nbytes) {
1228 ret = 0;
1229 } else if (ret >= 0 && ret < aiocb->aio_nbytes) {
1230 ret = -EINVAL;
1232 break;
1233 case QEMU_AIO_WRITE:
1234 ret = handle_aiocb_rw(aiocb);
1235 if (ret == aiocb->aio_nbytes) {
1236 ret = 0;
1237 } else if (ret >= 0 && ret < aiocb->aio_nbytes) {
1238 ret = -EINVAL;
1240 break;
1241 case QEMU_AIO_FLUSH:
1242 ret = handle_aiocb_flush(aiocb);
1243 break;
1244 case QEMU_AIO_IOCTL:
1245 ret = handle_aiocb_ioctl(aiocb);
1246 break;
1247 case QEMU_AIO_DISCARD:
1248 ret = handle_aiocb_discard(aiocb);
1249 break;
1250 case QEMU_AIO_WRITE_ZEROES:
1251 ret = handle_aiocb_write_zeroes(aiocb);
1252 break;
1253 default:
1254 fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
1255 ret = -EINVAL;
1256 break;
1259 g_free(aiocb);
1260 return ret;
1263 static int paio_submit_co(BlockDriverState *bs, int fd,
1264 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1265 int type)
1267 RawPosixAIOData *acb = g_new(RawPosixAIOData, 1);
1268 ThreadPool *pool;
1270 acb->bs = bs;
1271 acb->aio_type = type;
1272 acb->aio_fildes = fd;
1274 acb->aio_nbytes = nb_sectors * BDRV_SECTOR_SIZE;
1275 acb->aio_offset = sector_num * BDRV_SECTOR_SIZE;
1277 if (qiov) {
1278 acb->aio_iov = qiov->iov;
1279 acb->aio_niov = qiov->niov;
1280 assert(qiov->size == acb->aio_nbytes);
1283 trace_paio_submit_co(sector_num, nb_sectors, type);
1284 pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
1285 return thread_pool_submit_co(pool, aio_worker, acb);
1288 static BlockAIOCB *paio_submit(BlockDriverState *bs, int fd,
1289 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1290 BlockCompletionFunc *cb, void *opaque, int type)
1292 RawPosixAIOData *acb = g_new(RawPosixAIOData, 1);
1293 ThreadPool *pool;
1295 acb->bs = bs;
1296 acb->aio_type = type;
1297 acb->aio_fildes = fd;
1299 acb->aio_nbytes = nb_sectors * BDRV_SECTOR_SIZE;
1300 acb->aio_offset = sector_num * BDRV_SECTOR_SIZE;
1302 if (qiov) {
1303 acb->aio_iov = qiov->iov;
1304 acb->aio_niov = qiov->niov;
1305 assert(qiov->size == acb->aio_nbytes);
1308 trace_paio_submit(acb, opaque, sector_num, nb_sectors, type);
1309 pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
1310 return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
1313 static BlockAIOCB *raw_aio_submit(BlockDriverState *bs,
1314 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1315 BlockCompletionFunc *cb, void *opaque, int type)
1317 BDRVRawState *s = bs->opaque;
1319 if (fd_open(bs) < 0)
1320 return NULL;
1323 * Check if the underlying device requires requests to be aligned,
1324 * and if the request we are trying to submit is aligned or not.
1325 * If this is the case tell the low-level driver that it needs
1326 * to copy the buffer.
1328 if (s->needs_alignment) {
1329 if (!bdrv_qiov_is_aligned(bs, qiov)) {
1330 type |= QEMU_AIO_MISALIGNED;
1331 #ifdef CONFIG_LINUX_AIO
1332 } else if (s->use_aio) {
1333 return laio_submit(bs, s->aio_ctx, s->fd, sector_num, qiov,
1334 nb_sectors, cb, opaque, type);
1335 #endif
1339 return paio_submit(bs, s->fd, sector_num, qiov, nb_sectors,
1340 cb, opaque, type);
1343 static void raw_aio_plug(BlockDriverState *bs)
1345 #ifdef CONFIG_LINUX_AIO
1346 BDRVRawState *s = bs->opaque;
1347 if (s->use_aio) {
1348 laio_io_plug(bs, s->aio_ctx);
1350 #endif
1353 static void raw_aio_unplug(BlockDriverState *bs)
1355 #ifdef CONFIG_LINUX_AIO
1356 BDRVRawState *s = bs->opaque;
1357 if (s->use_aio) {
1358 laio_io_unplug(bs, s->aio_ctx, true);
1360 #endif
1363 static void raw_aio_flush_io_queue(BlockDriverState *bs)
1365 #ifdef CONFIG_LINUX_AIO
1366 BDRVRawState *s = bs->opaque;
1367 if (s->use_aio) {
1368 laio_io_unplug(bs, s->aio_ctx, false);
1370 #endif
1373 static BlockAIOCB *raw_aio_readv(BlockDriverState *bs,
1374 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1375 BlockCompletionFunc *cb, void *opaque)
1377 return raw_aio_submit(bs, sector_num, qiov, nb_sectors,
1378 cb, opaque, QEMU_AIO_READ);
1381 static BlockAIOCB *raw_aio_writev(BlockDriverState *bs,
1382 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1383 BlockCompletionFunc *cb, void *opaque)
1385 return raw_aio_submit(bs, sector_num, qiov, nb_sectors,
1386 cb, opaque, QEMU_AIO_WRITE);
1389 static BlockAIOCB *raw_aio_flush(BlockDriverState *bs,
1390 BlockCompletionFunc *cb, void *opaque)
1392 BDRVRawState *s = bs->opaque;
1394 if (fd_open(bs) < 0)
1395 return NULL;
1397 return paio_submit(bs, s->fd, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
1400 static void raw_close(BlockDriverState *bs)
1402 BDRVRawState *s = bs->opaque;
1404 raw_detach_aio_context(bs);
1406 #ifdef CONFIG_LINUX_AIO
1407 if (s->use_aio) {
1408 laio_cleanup(s->aio_ctx);
1410 #endif
1411 if (s->fd >= 0) {
1412 qemu_close(s->fd);
1413 s->fd = -1;
1417 static int raw_truncate(BlockDriverState *bs, int64_t offset)
1419 BDRVRawState *s = bs->opaque;
1420 struct stat st;
1422 if (fstat(s->fd, &st)) {
1423 return -errno;
1426 if (S_ISREG(st.st_mode)) {
1427 if (ftruncate(s->fd, offset) < 0) {
1428 return -errno;
1430 } else if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
1431 if (offset > raw_getlength(bs)) {
1432 return -EINVAL;
1434 } else {
1435 return -ENOTSUP;
1438 return 0;
1441 #ifdef __OpenBSD__
1442 static int64_t raw_getlength(BlockDriverState *bs)
1444 BDRVRawState *s = bs->opaque;
1445 int fd = s->fd;
1446 struct stat st;
1448 if (fstat(fd, &st))
1449 return -errno;
1450 if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
1451 struct disklabel dl;
1453 if (ioctl(fd, DIOCGDINFO, &dl))
1454 return -errno;
1455 return (uint64_t)dl.d_secsize *
1456 dl.d_partitions[DISKPART(st.st_rdev)].p_size;
1457 } else
1458 return st.st_size;
1460 #elif defined(__NetBSD__)
1461 static int64_t raw_getlength(BlockDriverState *bs)
1463 BDRVRawState *s = bs->opaque;
1464 int fd = s->fd;
1465 struct stat st;
1467 if (fstat(fd, &st))
1468 return -errno;
1469 if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
1470 struct dkwedge_info dkw;
1472 if (ioctl(fd, DIOCGWEDGEINFO, &dkw) != -1) {
1473 return dkw.dkw_size * 512;
1474 } else {
1475 struct disklabel dl;
1477 if (ioctl(fd, DIOCGDINFO, &dl))
1478 return -errno;
1479 return (uint64_t)dl.d_secsize *
1480 dl.d_partitions[DISKPART(st.st_rdev)].p_size;
1482 } else
1483 return st.st_size;
1485 #elif defined(__sun__)
1486 static int64_t raw_getlength(BlockDriverState *bs)
1488 BDRVRawState *s = bs->opaque;
1489 struct dk_minfo minfo;
1490 int ret;
1491 int64_t size;
1493 ret = fd_open(bs);
1494 if (ret < 0) {
1495 return ret;
1499 * Use the DKIOCGMEDIAINFO ioctl to read the size.
1501 ret = ioctl(s->fd, DKIOCGMEDIAINFO, &minfo);
1502 if (ret != -1) {
1503 return minfo.dki_lbsize * minfo.dki_capacity;
1507 * There are reports that lseek on some devices fails, but
1508 * irc discussion said that contingency on contingency was overkill.
1510 size = lseek(s->fd, 0, SEEK_END);
1511 if (size < 0) {
1512 return -errno;
1514 return size;
1516 #elif defined(CONFIG_BSD)
1517 static int64_t raw_getlength(BlockDriverState *bs)
1519 BDRVRawState *s = bs->opaque;
1520 int fd = s->fd;
1521 int64_t size;
1522 struct stat sb;
1523 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
1524 int reopened = 0;
1525 #endif
1526 int ret;
1528 ret = fd_open(bs);
1529 if (ret < 0)
1530 return ret;
1532 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
1533 again:
1534 #endif
1535 if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
1536 #ifdef DIOCGMEDIASIZE
1537 if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
1538 #elif defined(DIOCGPART)
1540 struct partinfo pi;
1541 if (ioctl(fd, DIOCGPART, &pi) == 0)
1542 size = pi.media_size;
1543 else
1544 size = 0;
1546 if (size == 0)
1547 #endif
1548 #if defined(__APPLE__) && defined(__MACH__)
1550 uint64_t sectors = 0;
1551 uint32_t sector_size = 0;
1553 if (ioctl(fd, DKIOCGETBLOCKCOUNT, &sectors) == 0
1554 && ioctl(fd, DKIOCGETBLOCKSIZE, &sector_size) == 0) {
1555 size = sectors * sector_size;
1556 } else {
1557 size = lseek(fd, 0LL, SEEK_END);
1558 if (size < 0) {
1559 return -errno;
1563 #else
1564 size = lseek(fd, 0LL, SEEK_END);
1565 if (size < 0) {
1566 return -errno;
1568 #endif
1569 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1570 switch(s->type) {
1571 case FTYPE_CD:
1572 /* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */
1573 if (size == 2048LL * (unsigned)-1)
1574 size = 0;
1575 /* XXX no disc? maybe we need to reopen... */
1576 if (size <= 0 && !reopened && cdrom_reopen(bs) >= 0) {
1577 reopened = 1;
1578 goto again;
1581 #endif
1582 } else {
1583 size = lseek(fd, 0, SEEK_END);
1584 if (size < 0) {
1585 return -errno;
1588 return size;
1590 #else
1591 static int64_t raw_getlength(BlockDriverState *bs)
1593 BDRVRawState *s = bs->opaque;
1594 int ret;
1595 int64_t size;
1597 ret = fd_open(bs);
1598 if (ret < 0) {
1599 return ret;
1602 size = lseek(s->fd, 0, SEEK_END);
1603 if (size < 0) {
1604 return -errno;
1606 return size;
1608 #endif
1610 static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
1612 struct stat st;
1613 BDRVRawState *s = bs->opaque;
1615 if (fstat(s->fd, &st) < 0) {
1616 return -errno;
1618 return (int64_t)st.st_blocks * 512;
1621 static int raw_create(const char *filename, QemuOpts *opts, Error **errp)
1623 int fd;
1624 int result = 0;
1625 int64_t total_size = 0;
1626 bool nocow = false;
1627 PreallocMode prealloc;
1628 char *buf = NULL;
1629 Error *local_err = NULL;
1631 strstart(filename, "file:", &filename);
1633 /* Read out options */
1634 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
1635 BDRV_SECTOR_SIZE);
1636 nocow = qemu_opt_get_bool(opts, BLOCK_OPT_NOCOW, false);
1637 buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC);
1638 prealloc = qapi_enum_parse(PreallocMode_lookup, buf,
1639 PREALLOC_MODE_MAX, PREALLOC_MODE_OFF,
1640 &local_err);
1641 g_free(buf);
1642 if (local_err) {
1643 error_propagate(errp, local_err);
1644 result = -EINVAL;
1645 goto out;
1648 fd = qemu_open(filename, O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
1649 0644);
1650 if (fd < 0) {
1651 result = -errno;
1652 error_setg_errno(errp, -result, "Could not create file");
1653 goto out;
1656 if (nocow) {
1657 #ifdef __linux__
1658 /* Set NOCOW flag to solve performance issue on fs like btrfs.
1659 * This is an optimisation. The FS_IOC_SETFLAGS ioctl return value
1660 * will be ignored since any failure of this operation should not
1661 * block the left work.
1663 int attr;
1664 if (ioctl(fd, FS_IOC_GETFLAGS, &attr) == 0) {
1665 attr |= FS_NOCOW_FL;
1666 ioctl(fd, FS_IOC_SETFLAGS, &attr);
1668 #endif
1671 if (ftruncate(fd, total_size) != 0) {
1672 result = -errno;
1673 error_setg_errno(errp, -result, "Could not resize file");
1674 goto out_close;
1677 switch (prealloc) {
1678 #ifdef CONFIG_POSIX_FALLOCATE
1679 case PREALLOC_MODE_FALLOC:
1680 /* posix_fallocate() doesn't set errno. */
1681 result = -posix_fallocate(fd, 0, total_size);
1682 if (result != 0) {
1683 error_setg_errno(errp, -result,
1684 "Could not preallocate data for the new file");
1686 break;
1687 #endif
1688 case PREALLOC_MODE_FULL:
1690 int64_t num = 0, left = total_size;
1691 buf = g_malloc0(65536);
1693 while (left > 0) {
1694 num = MIN(left, 65536);
1695 result = write(fd, buf, num);
1696 if (result < 0) {
1697 result = -errno;
1698 error_setg_errno(errp, -result,
1699 "Could not write to the new file");
1700 break;
1702 left -= result;
1704 if (result >= 0) {
1705 result = fsync(fd);
1706 if (result < 0) {
1707 result = -errno;
1708 error_setg_errno(errp, -result,
1709 "Could not flush new file to disk");
1712 g_free(buf);
1713 break;
1715 case PREALLOC_MODE_OFF:
1716 break;
1717 default:
1718 result = -EINVAL;
1719 error_setg(errp, "Unsupported preallocation mode: %s",
1720 PreallocMode_lookup[prealloc]);
1721 break;
1724 out_close:
1725 if (qemu_close(fd) != 0 && result == 0) {
1726 result = -errno;
1727 error_setg_errno(errp, -result, "Could not close the new file");
1729 out:
1730 return result;
1734 * Find allocation range in @bs around offset @start.
1735 * May change underlying file descriptor's file offset.
1736 * If @start is not in a hole, store @start in @data, and the
1737 * beginning of the next hole in @hole, and return 0.
1738 * If @start is in a non-trailing hole, store @start in @hole and the
1739 * beginning of the next non-hole in @data, and return 0.
1740 * If @start is in a trailing hole or beyond EOF, return -ENXIO.
1741 * If we can't find out, return a negative errno other than -ENXIO.
1743 static int find_allocation(BlockDriverState *bs, off_t start,
1744 off_t *data, off_t *hole)
1746 #if defined SEEK_HOLE && defined SEEK_DATA
1747 BDRVRawState *s = bs->opaque;
1748 off_t offs;
1751 * SEEK_DATA cases:
1752 * D1. offs == start: start is in data
1753 * D2. offs > start: start is in a hole, next data at offs
1754 * D3. offs < 0, errno = ENXIO: either start is in a trailing hole
1755 * or start is beyond EOF
1756 * If the latter happens, the file has been truncated behind
1757 * our back since we opened it. All bets are off then.
1758 * Treating like a trailing hole is simplest.
1759 * D4. offs < 0, errno != ENXIO: we learned nothing
1761 offs = lseek(s->fd, start, SEEK_DATA);
1762 if (offs < 0) {
1763 return -errno; /* D3 or D4 */
1765 assert(offs >= start);
1767 if (offs > start) {
1768 /* D2: in hole, next data at offs */
1769 *hole = start;
1770 *data = offs;
1771 return 0;
1774 /* D1: in data, end not yet known */
1777 * SEEK_HOLE cases:
1778 * H1. offs == start: start is in a hole
1779 * If this happens here, a hole has been dug behind our back
1780 * since the previous lseek().
1781 * H2. offs > start: either start is in data, next hole at offs,
1782 * or start is in trailing hole, EOF at offs
1783 * Linux treats trailing holes like any other hole: offs ==
1784 * start. Solaris seeks to EOF instead: offs > start (blech).
1785 * If that happens here, a hole has been dug behind our back
1786 * since the previous lseek().
1787 * H3. offs < 0, errno = ENXIO: start is beyond EOF
1788 * If this happens, the file has been truncated behind our
1789 * back since we opened it. Treat it like a trailing hole.
1790 * H4. offs < 0, errno != ENXIO: we learned nothing
1791 * Pretend we know nothing at all, i.e. "forget" about D1.
1793 offs = lseek(s->fd, start, SEEK_HOLE);
1794 if (offs < 0) {
1795 return -errno; /* D1 and (H3 or H4) */
1797 assert(offs >= start);
1799 if (offs > start) {
1801 * D1 and H2: either in data, next hole at offs, or it was in
1802 * data but is now in a trailing hole. In the latter case,
1803 * all bets are off. Treating it as if it there was data all
1804 * the way to EOF is safe, so simply do that.
1806 *data = start;
1807 *hole = offs;
1808 return 0;
1811 /* D1 and H1 */
1812 return -EBUSY;
1813 #else
1814 return -ENOTSUP;
1815 #endif
1819 * Returns the allocation status of the specified sectors.
1821 * If 'sector_num' is beyond the end of the disk image the return value is 0
1822 * and 'pnum' is set to 0.
1824 * 'pnum' is set to the number of sectors (including and immediately following
1825 * the specified sector) that are known to be in the same
1826 * allocated/unallocated state.
1828 * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes
1829 * beyond the end of the disk image it will be clamped.
1831 static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
1832 int64_t sector_num,
1833 int nb_sectors, int *pnum)
1835 off_t start, data = 0, hole = 0;
1836 int64_t total_size;
1837 int ret;
1839 ret = fd_open(bs);
1840 if (ret < 0) {
1841 return ret;
1844 start = sector_num * BDRV_SECTOR_SIZE;
1845 total_size = bdrv_getlength(bs);
1846 if (total_size < 0) {
1847 return total_size;
1848 } else if (start >= total_size) {
1849 *pnum = 0;
1850 return 0;
1851 } else if (start + nb_sectors * BDRV_SECTOR_SIZE > total_size) {
1852 nb_sectors = DIV_ROUND_UP(total_size - start, BDRV_SECTOR_SIZE);
1855 ret = find_allocation(bs, start, &data, &hole);
1856 if (ret == -ENXIO) {
1857 /* Trailing hole */
1858 *pnum = nb_sectors;
1859 ret = BDRV_BLOCK_ZERO;
1860 } else if (ret < 0) {
1861 /* No info available, so pretend there are no holes */
1862 *pnum = nb_sectors;
1863 ret = BDRV_BLOCK_DATA;
1864 } else if (data == start) {
1865 /* On a data extent, compute sectors to the end of the extent,
1866 * possibly including a partial sector at EOF. */
1867 *pnum = MIN(nb_sectors, DIV_ROUND_UP(hole - start, BDRV_SECTOR_SIZE));
1868 ret = BDRV_BLOCK_DATA;
1869 } else {
1870 /* On a hole, compute sectors to the beginning of the next extent. */
1871 assert(hole == start);
1872 *pnum = MIN(nb_sectors, (data - start) / BDRV_SECTOR_SIZE);
1873 ret = BDRV_BLOCK_ZERO;
1875 return ret | BDRV_BLOCK_OFFSET_VALID | start;
1878 static coroutine_fn BlockAIOCB *raw_aio_discard(BlockDriverState *bs,
1879 int64_t sector_num, int nb_sectors,
1880 BlockCompletionFunc *cb, void *opaque)
1882 BDRVRawState *s = bs->opaque;
1884 return paio_submit(bs, s->fd, sector_num, NULL, nb_sectors,
1885 cb, opaque, QEMU_AIO_DISCARD);
1888 static int coroutine_fn raw_co_write_zeroes(
1889 BlockDriverState *bs, int64_t sector_num,
1890 int nb_sectors, BdrvRequestFlags flags)
1892 BDRVRawState *s = bs->opaque;
1894 if (!(flags & BDRV_REQ_MAY_UNMAP)) {
1895 return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors,
1896 QEMU_AIO_WRITE_ZEROES);
1897 } else if (s->discard_zeroes) {
1898 return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors,
1899 QEMU_AIO_DISCARD);
1901 return -ENOTSUP;
1904 static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1906 BDRVRawState *s = bs->opaque;
1908 bdi->unallocated_blocks_are_zero = s->discard_zeroes;
1909 bdi->can_write_zeroes_with_unmap = s->discard_zeroes;
1910 return 0;
1913 static QemuOptsList raw_create_opts = {
1914 .name = "raw-create-opts",
1915 .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head),
1916 .desc = {
1918 .name = BLOCK_OPT_SIZE,
1919 .type = QEMU_OPT_SIZE,
1920 .help = "Virtual disk size"
1923 .name = BLOCK_OPT_NOCOW,
1924 .type = QEMU_OPT_BOOL,
1925 .help = "Turn off copy-on-write (valid only on btrfs)"
1928 .name = BLOCK_OPT_PREALLOC,
1929 .type = QEMU_OPT_STRING,
1930 .help = "Preallocation mode (allowed values: off, falloc, full)"
1932 { /* end of list */ }
1936 BlockDriver bdrv_file = {
1937 .format_name = "file",
1938 .protocol_name = "file",
1939 .instance_size = sizeof(BDRVRawState),
1940 .bdrv_needs_filename = true,
1941 .bdrv_probe = NULL, /* no probe for protocols */
1942 .bdrv_parse_filename = raw_parse_filename,
1943 .bdrv_file_open = raw_open,
1944 .bdrv_reopen_prepare = raw_reopen_prepare,
1945 .bdrv_reopen_commit = raw_reopen_commit,
1946 .bdrv_reopen_abort = raw_reopen_abort,
1947 .bdrv_close = raw_close,
1948 .bdrv_create = raw_create,
1949 .bdrv_has_zero_init = bdrv_has_zero_init_1,
1950 .bdrv_co_get_block_status = raw_co_get_block_status,
1951 .bdrv_co_write_zeroes = raw_co_write_zeroes,
1953 .bdrv_aio_readv = raw_aio_readv,
1954 .bdrv_aio_writev = raw_aio_writev,
1955 .bdrv_aio_flush = raw_aio_flush,
1956 .bdrv_aio_discard = raw_aio_discard,
1957 .bdrv_refresh_limits = raw_refresh_limits,
1958 .bdrv_io_plug = raw_aio_plug,
1959 .bdrv_io_unplug = raw_aio_unplug,
1960 .bdrv_flush_io_queue = raw_aio_flush_io_queue,
1962 .bdrv_truncate = raw_truncate,
1963 .bdrv_getlength = raw_getlength,
1964 .bdrv_get_info = raw_get_info,
1965 .bdrv_get_allocated_file_size
1966 = raw_get_allocated_file_size,
1968 .bdrv_detach_aio_context = raw_detach_aio_context,
1969 .bdrv_attach_aio_context = raw_attach_aio_context,
1971 .create_opts = &raw_create_opts,
1974 /***********************************************/
1975 /* host device */
1977 #if defined(__APPLE__) && defined(__MACH__)
1978 static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
1979 static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );
1981 kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
1983 kern_return_t kernResult;
1984 mach_port_t masterPort;
1985 CFMutableDictionaryRef classesToMatch;
1987 kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
1988 if ( KERN_SUCCESS != kernResult ) {
1989 printf( "IOMasterPort returned %d\n", kernResult );
1992 classesToMatch = IOServiceMatching( kIOCDMediaClass );
1993 if ( classesToMatch == NULL ) {
1994 printf( "IOServiceMatching returned a NULL dictionary.\n" );
1995 } else {
1996 CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );
1998 kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );
1999 if ( KERN_SUCCESS != kernResult )
2001 printf( "IOServiceGetMatchingServices returned %d\n", kernResult );
2004 return kernResult;
2007 kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
2009 io_object_t nextMedia;
2010 kern_return_t kernResult = KERN_FAILURE;
2011 *bsdPath = '\0';
2012 nextMedia = IOIteratorNext( mediaIterator );
2013 if ( nextMedia )
2015 CFTypeRef bsdPathAsCFString;
2016 bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
2017 if ( bsdPathAsCFString ) {
2018 size_t devPathLength;
2019 strcpy( bsdPath, _PATH_DEV );
2020 strcat( bsdPath, "r" );
2021 devPathLength = strlen( bsdPath );
2022 if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
2023 kernResult = KERN_SUCCESS;
2025 CFRelease( bsdPathAsCFString );
2027 IOObjectRelease( nextMedia );
2030 return kernResult;
2033 #endif
2035 static int hdev_probe_device(const char *filename)
2037 struct stat st;
2039 /* allow a dedicated CD-ROM driver to match with a higher priority */
2040 if (strstart(filename, "/dev/cdrom", NULL))
2041 return 50;
2043 if (stat(filename, &st) >= 0 &&
2044 (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
2045 return 100;
2048 return 0;
2051 static int check_hdev_writable(BDRVRawState *s)
2053 #if defined(BLKROGET)
2054 /* Linux block devices can be configured "read-only" using blockdev(8).
2055 * This is independent of device node permissions and therefore open(2)
2056 * with O_RDWR succeeds. Actual writes fail with EPERM.
2058 * bdrv_open() is supposed to fail if the disk is read-only. Explicitly
2059 * check for read-only block devices so that Linux block devices behave
2060 * properly.
2062 struct stat st;
2063 int readonly = 0;
2065 if (fstat(s->fd, &st)) {
2066 return -errno;
2069 if (!S_ISBLK(st.st_mode)) {
2070 return 0;
2073 if (ioctl(s->fd, BLKROGET, &readonly) < 0) {
2074 return -errno;
2077 if (readonly) {
2078 return -EACCES;
2080 #endif /* defined(BLKROGET) */
2081 return 0;
2084 static void hdev_parse_filename(const char *filename, QDict *options,
2085 Error **errp)
2087 /* The prefix is optional, just as for "file". */
2088 strstart(filename, "host_device:", &filename);
2090 qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename)));
2093 static bool hdev_is_sg(BlockDriverState *bs)
2096 #if defined(__linux__)
2098 struct stat st;
2099 struct sg_scsi_id scsiid;
2100 int sg_version;
2102 if (stat(bs->filename, &st) >= 0 && S_ISCHR(st.st_mode) &&
2103 !bdrv_ioctl(bs, SG_GET_VERSION_NUM, &sg_version) &&
2104 !bdrv_ioctl(bs, SG_GET_SCSI_ID, &scsiid)) {
2105 DPRINTF("SG device found: type=%d, version=%d\n",
2106 scsiid.scsi_type, sg_version);
2107 return true;
2110 #endif
2112 return false;
2115 static int hdev_open(BlockDriverState *bs, QDict *options, int flags,
2116 Error **errp)
2118 BDRVRawState *s = bs->opaque;
2119 Error *local_err = NULL;
2120 int ret;
2122 #if defined(__APPLE__) && defined(__MACH__)
2123 const char *filename = qdict_get_str(options, "filename");
2125 if (strstart(filename, "/dev/cdrom", NULL)) {
2126 kern_return_t kernResult;
2127 io_iterator_t mediaIterator;
2128 char bsdPath[ MAXPATHLEN ];
2129 int fd;
2131 kernResult = FindEjectableCDMedia( &mediaIterator );
2132 kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );
2134 if ( bsdPath[ 0 ] != '\0' ) {
2135 strcat(bsdPath,"s0");
2136 /* some CDs don't have a partition 0 */
2137 fd = qemu_open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
2138 if (fd < 0) {
2139 bsdPath[strlen(bsdPath)-1] = '1';
2140 } else {
2141 qemu_close(fd);
2143 filename = bsdPath;
2144 qdict_put(options, "filename", qstring_from_str(filename));
2147 if ( mediaIterator )
2148 IOObjectRelease( mediaIterator );
2150 #endif
2152 s->type = FTYPE_FILE;
2154 ret = raw_open_common(bs, options, flags, 0, &local_err);
2155 if (ret < 0) {
2156 if (local_err) {
2157 error_propagate(errp, local_err);
2159 return ret;
2162 /* Since this does ioctl the device must be already opened */
2163 bs->sg = hdev_is_sg(bs);
2165 if (flags & BDRV_O_RDWR) {
2166 ret = check_hdev_writable(s);
2167 if (ret < 0) {
2168 raw_close(bs);
2169 error_setg_errno(errp, -ret, "The device is not writable");
2170 return ret;
2174 return ret;
2177 #if defined(__linux__)
2178 static int hdev_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
2180 BDRVRawState *s = bs->opaque;
2182 return ioctl(s->fd, req, buf);
2185 static BlockAIOCB *hdev_aio_ioctl(BlockDriverState *bs,
2186 unsigned long int req, void *buf,
2187 BlockCompletionFunc *cb, void *opaque)
2189 BDRVRawState *s = bs->opaque;
2190 RawPosixAIOData *acb;
2191 ThreadPool *pool;
2193 if (fd_open(bs) < 0)
2194 return NULL;
2196 acb = g_new(RawPosixAIOData, 1);
2197 acb->bs = bs;
2198 acb->aio_type = QEMU_AIO_IOCTL;
2199 acb->aio_fildes = s->fd;
2200 acb->aio_offset = 0;
2201 acb->aio_ioctl_buf = buf;
2202 acb->aio_ioctl_cmd = req;
2203 pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
2204 return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
2206 #endif /* linux */
2208 static int fd_open(BlockDriverState *bs)
2210 BDRVRawState *s = bs->opaque;
2212 /* this is just to ensure s->fd is sane (its called by io ops) */
2213 if (s->fd >= 0)
2214 return 0;
2215 return -EIO;
2218 static coroutine_fn BlockAIOCB *hdev_aio_discard(BlockDriverState *bs,
2219 int64_t sector_num, int nb_sectors,
2220 BlockCompletionFunc *cb, void *opaque)
2222 BDRVRawState *s = bs->opaque;
2224 if (fd_open(bs) < 0) {
2225 return NULL;
2227 return paio_submit(bs, s->fd, sector_num, NULL, nb_sectors,
2228 cb, opaque, QEMU_AIO_DISCARD|QEMU_AIO_BLKDEV);
2231 static coroutine_fn int hdev_co_write_zeroes(BlockDriverState *bs,
2232 int64_t sector_num, int nb_sectors, BdrvRequestFlags flags)
2234 BDRVRawState *s = bs->opaque;
2235 int rc;
2237 rc = fd_open(bs);
2238 if (rc < 0) {
2239 return rc;
2241 if (!(flags & BDRV_REQ_MAY_UNMAP)) {
2242 return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors,
2243 QEMU_AIO_WRITE_ZEROES|QEMU_AIO_BLKDEV);
2244 } else if (s->discard_zeroes) {
2245 return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors,
2246 QEMU_AIO_DISCARD|QEMU_AIO_BLKDEV);
2248 return -ENOTSUP;
2251 static int hdev_create(const char *filename, QemuOpts *opts,
2252 Error **errp)
2254 int fd;
2255 int ret = 0;
2256 struct stat stat_buf;
2257 int64_t total_size = 0;
2258 bool has_prefix;
2260 /* This function is used by both protocol block drivers and therefore either
2261 * of these prefixes may be given.
2262 * The return value has to be stored somewhere, otherwise this is an error
2263 * due to -Werror=unused-value. */
2264 has_prefix =
2265 strstart(filename, "host_device:", &filename) ||
2266 strstart(filename, "host_cdrom:" , &filename);
2268 (void)has_prefix;
2270 ret = raw_normalize_devicepath(&filename);
2271 if (ret < 0) {
2272 error_setg_errno(errp, -ret, "Could not normalize device path");
2273 return ret;
2276 /* Read out options */
2277 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
2278 BDRV_SECTOR_SIZE);
2280 fd = qemu_open(filename, O_WRONLY | O_BINARY);
2281 if (fd < 0) {
2282 ret = -errno;
2283 error_setg_errno(errp, -ret, "Could not open device");
2284 return ret;
2287 if (fstat(fd, &stat_buf) < 0) {
2288 ret = -errno;
2289 error_setg_errno(errp, -ret, "Could not stat device");
2290 } else if (!S_ISBLK(stat_buf.st_mode) && !S_ISCHR(stat_buf.st_mode)) {
2291 error_setg(errp,
2292 "The given file is neither a block nor a character device");
2293 ret = -ENODEV;
2294 } else if (lseek(fd, 0, SEEK_END) < total_size) {
2295 error_setg(errp, "Device is too small");
2296 ret = -ENOSPC;
2299 qemu_close(fd);
2300 return ret;
2303 static BlockDriver bdrv_host_device = {
2304 .format_name = "host_device",
2305 .protocol_name = "host_device",
2306 .instance_size = sizeof(BDRVRawState),
2307 .bdrv_needs_filename = true,
2308 .bdrv_probe_device = hdev_probe_device,
2309 .bdrv_parse_filename = hdev_parse_filename,
2310 .bdrv_file_open = hdev_open,
2311 .bdrv_close = raw_close,
2312 .bdrv_reopen_prepare = raw_reopen_prepare,
2313 .bdrv_reopen_commit = raw_reopen_commit,
2314 .bdrv_reopen_abort = raw_reopen_abort,
2315 .bdrv_create = hdev_create,
2316 .create_opts = &raw_create_opts,
2317 .bdrv_co_write_zeroes = hdev_co_write_zeroes,
2319 .bdrv_aio_readv = raw_aio_readv,
2320 .bdrv_aio_writev = raw_aio_writev,
2321 .bdrv_aio_flush = raw_aio_flush,
2322 .bdrv_aio_discard = hdev_aio_discard,
2323 .bdrv_refresh_limits = raw_refresh_limits,
2324 .bdrv_io_plug = raw_aio_plug,
2325 .bdrv_io_unplug = raw_aio_unplug,
2326 .bdrv_flush_io_queue = raw_aio_flush_io_queue,
2328 .bdrv_truncate = raw_truncate,
2329 .bdrv_getlength = raw_getlength,
2330 .bdrv_get_info = raw_get_info,
2331 .bdrv_get_allocated_file_size
2332 = raw_get_allocated_file_size,
2333 .bdrv_probe_blocksizes = hdev_probe_blocksizes,
2334 .bdrv_probe_geometry = hdev_probe_geometry,
2336 .bdrv_detach_aio_context = raw_detach_aio_context,
2337 .bdrv_attach_aio_context = raw_attach_aio_context,
2339 /* generic scsi device */
2340 #ifdef __linux__
2341 .bdrv_ioctl = hdev_ioctl,
2342 .bdrv_aio_ioctl = hdev_aio_ioctl,
2343 #endif
2346 #if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2347 static void cdrom_parse_filename(const char *filename, QDict *options,
2348 Error **errp)
2350 /* The prefix is optional, just as for "file". */
2351 strstart(filename, "host_cdrom:", &filename);
2353 qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename)));
2355 #endif
2357 #ifdef __linux__
2358 static int cdrom_open(BlockDriverState *bs, QDict *options, int flags,
2359 Error **errp)
2361 BDRVRawState *s = bs->opaque;
2362 Error *local_err = NULL;
2363 int ret;
2365 s->type = FTYPE_CD;
2367 /* open will not fail even if no CD is inserted, so add O_NONBLOCK */
2368 ret = raw_open_common(bs, options, flags, O_NONBLOCK, &local_err);
2369 if (local_err) {
2370 error_propagate(errp, local_err);
2372 return ret;
2375 static int cdrom_probe_device(const char *filename)
2377 int fd, ret;
2378 int prio = 0;
2379 struct stat st;
2381 fd = qemu_open(filename, O_RDONLY | O_NONBLOCK);
2382 if (fd < 0) {
2383 goto out;
2385 ret = fstat(fd, &st);
2386 if (ret == -1 || !S_ISBLK(st.st_mode)) {
2387 goto outc;
2390 /* Attempt to detect via a CDROM specific ioctl */
2391 ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
2392 if (ret >= 0)
2393 prio = 100;
2395 outc:
2396 qemu_close(fd);
2397 out:
2398 return prio;
2401 static bool cdrom_is_inserted(BlockDriverState *bs)
2403 BDRVRawState *s = bs->opaque;
2404 int ret;
2406 ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
2407 return ret == CDS_DISC_OK;
2410 static void cdrom_eject(BlockDriverState *bs, bool eject_flag)
2412 BDRVRawState *s = bs->opaque;
2414 if (eject_flag) {
2415 if (ioctl(s->fd, CDROMEJECT, NULL) < 0)
2416 perror("CDROMEJECT");
2417 } else {
2418 if (ioctl(s->fd, CDROMCLOSETRAY, NULL) < 0)
2419 perror("CDROMEJECT");
2423 static void cdrom_lock_medium(BlockDriverState *bs, bool locked)
2425 BDRVRawState *s = bs->opaque;
2427 if (ioctl(s->fd, CDROM_LOCKDOOR, locked) < 0) {
2429 * Note: an error can happen if the distribution automatically
2430 * mounts the CD-ROM
2432 /* perror("CDROM_LOCKDOOR"); */
2436 static BlockDriver bdrv_host_cdrom = {
2437 .format_name = "host_cdrom",
2438 .protocol_name = "host_cdrom",
2439 .instance_size = sizeof(BDRVRawState),
2440 .bdrv_needs_filename = true,
2441 .bdrv_probe_device = cdrom_probe_device,
2442 .bdrv_parse_filename = cdrom_parse_filename,
2443 .bdrv_file_open = cdrom_open,
2444 .bdrv_close = raw_close,
2445 .bdrv_reopen_prepare = raw_reopen_prepare,
2446 .bdrv_reopen_commit = raw_reopen_commit,
2447 .bdrv_reopen_abort = raw_reopen_abort,
2448 .bdrv_create = hdev_create,
2449 .create_opts = &raw_create_opts,
2451 .bdrv_aio_readv = raw_aio_readv,
2452 .bdrv_aio_writev = raw_aio_writev,
2453 .bdrv_aio_flush = raw_aio_flush,
2454 .bdrv_refresh_limits = raw_refresh_limits,
2455 .bdrv_io_plug = raw_aio_plug,
2456 .bdrv_io_unplug = raw_aio_unplug,
2457 .bdrv_flush_io_queue = raw_aio_flush_io_queue,
2459 .bdrv_truncate = raw_truncate,
2460 .bdrv_getlength = raw_getlength,
2461 .has_variable_length = true,
2462 .bdrv_get_allocated_file_size
2463 = raw_get_allocated_file_size,
2465 .bdrv_detach_aio_context = raw_detach_aio_context,
2466 .bdrv_attach_aio_context = raw_attach_aio_context,
2468 /* removable device support */
2469 .bdrv_is_inserted = cdrom_is_inserted,
2470 .bdrv_eject = cdrom_eject,
2471 .bdrv_lock_medium = cdrom_lock_medium,
2473 /* generic scsi device */
2474 .bdrv_ioctl = hdev_ioctl,
2475 .bdrv_aio_ioctl = hdev_aio_ioctl,
2477 #endif /* __linux__ */
2479 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
2480 static int cdrom_open(BlockDriverState *bs, QDict *options, int flags,
2481 Error **errp)
2483 BDRVRawState *s = bs->opaque;
2484 Error *local_err = NULL;
2485 int ret;
2487 s->type = FTYPE_CD;
2489 ret = raw_open_common(bs, options, flags, 0, &local_err);
2490 if (ret) {
2491 if (local_err) {
2492 error_propagate(errp, local_err);
2494 return ret;
2497 /* make sure the door isn't locked at this time */
2498 ioctl(s->fd, CDIOCALLOW);
2499 return 0;
2502 static int cdrom_probe_device(const char *filename)
2504 if (strstart(filename, "/dev/cd", NULL) ||
2505 strstart(filename, "/dev/acd", NULL))
2506 return 100;
2507 return 0;
2510 static int cdrom_reopen(BlockDriverState *bs)
2512 BDRVRawState *s = bs->opaque;
2513 int fd;
2516 * Force reread of possibly changed/newly loaded disc,
2517 * FreeBSD seems to not notice sometimes...
2519 if (s->fd >= 0)
2520 qemu_close(s->fd);
2521 fd = qemu_open(bs->filename, s->open_flags, 0644);
2522 if (fd < 0) {
2523 s->fd = -1;
2524 return -EIO;
2526 s->fd = fd;
2528 /* make sure the door isn't locked at this time */
2529 ioctl(s->fd, CDIOCALLOW);
2530 return 0;
2533 static bool cdrom_is_inserted(BlockDriverState *bs)
2535 return raw_getlength(bs) > 0;
2538 static void cdrom_eject(BlockDriverState *bs, bool eject_flag)
2540 BDRVRawState *s = bs->opaque;
2542 if (s->fd < 0)
2543 return;
2545 (void) ioctl(s->fd, CDIOCALLOW);
2547 if (eject_flag) {
2548 if (ioctl(s->fd, CDIOCEJECT) < 0)
2549 perror("CDIOCEJECT");
2550 } else {
2551 if (ioctl(s->fd, CDIOCCLOSE) < 0)
2552 perror("CDIOCCLOSE");
2555 cdrom_reopen(bs);
2558 static void cdrom_lock_medium(BlockDriverState *bs, bool locked)
2560 BDRVRawState *s = bs->opaque;
2562 if (s->fd < 0)
2563 return;
2564 if (ioctl(s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
2566 * Note: an error can happen if the distribution automatically
2567 * mounts the CD-ROM
2569 /* perror("CDROM_LOCKDOOR"); */
2573 static BlockDriver bdrv_host_cdrom = {
2574 .format_name = "host_cdrom",
2575 .protocol_name = "host_cdrom",
2576 .instance_size = sizeof(BDRVRawState),
2577 .bdrv_needs_filename = true,
2578 .bdrv_probe_device = cdrom_probe_device,
2579 .bdrv_parse_filename = cdrom_parse_filename,
2580 .bdrv_file_open = cdrom_open,
2581 .bdrv_close = raw_close,
2582 .bdrv_reopen_prepare = raw_reopen_prepare,
2583 .bdrv_reopen_commit = raw_reopen_commit,
2584 .bdrv_reopen_abort = raw_reopen_abort,
2585 .bdrv_create = hdev_create,
2586 .create_opts = &raw_create_opts,
2588 .bdrv_aio_readv = raw_aio_readv,
2589 .bdrv_aio_writev = raw_aio_writev,
2590 .bdrv_aio_flush = raw_aio_flush,
2591 .bdrv_refresh_limits = raw_refresh_limits,
2592 .bdrv_io_plug = raw_aio_plug,
2593 .bdrv_io_unplug = raw_aio_unplug,
2594 .bdrv_flush_io_queue = raw_aio_flush_io_queue,
2596 .bdrv_truncate = raw_truncate,
2597 .bdrv_getlength = raw_getlength,
2598 .has_variable_length = true,
2599 .bdrv_get_allocated_file_size
2600 = raw_get_allocated_file_size,
2602 .bdrv_detach_aio_context = raw_detach_aio_context,
2603 .bdrv_attach_aio_context = raw_attach_aio_context,
2605 /* removable device support */
2606 .bdrv_is_inserted = cdrom_is_inserted,
2607 .bdrv_eject = cdrom_eject,
2608 .bdrv_lock_medium = cdrom_lock_medium,
2610 #endif /* __FreeBSD__ */
2612 static void bdrv_file_init(void)
2615 * Register all the drivers. Note that order is important, the driver
2616 * registered last will get probed first.
2618 bdrv_register(&bdrv_file);
2619 bdrv_register(&bdrv_host_device);
2620 #ifdef __linux__
2621 bdrv_register(&bdrv_host_cdrom);
2622 #endif
2623 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2624 bdrv_register(&bdrv_host_cdrom);
2625 #endif
2628 block_init(bdrv_file_init);